This is one of the things DS9 was powerfull in. By NOT coming up with tidy, neat little packages that left everybody happy. But sometimes having things ending in a way that made you feel uncomfortable. Made you feel that things weren't completely right.
That's what I found powerfull about the ending of Sons Of Mogh. Yeah, I don't agree with what Worf did. But the fact that DS9 had the stones to sometimes show other ways out then the clear, cookie-cutter perfect endings of TNG.... That's why I love DS9.